https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115890
Bug ID: 115890 Summary: ICE: verify_gimple failed with -flto Product: gcc Version: 15.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: lto Assignee: unassigned at gcc dot gnu.org Reporter: iamanonymous.cs at gmail dot com Target Milestone: --- ******************************************************************************* OS and Platform: $ uname -a: Linux 65dac7c84719 4.15.0-213-generic #224-Ubuntu SMP Mon Jun 19 13:30:12 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux ******************************************************************************* gcc version: Using built-in specs. COLLECT_GCC=/home/software/gcc-trunk-3aa004f/bin/gcc COLLECT_LTO_WRAPPER=/home/software/gcc-trunk-3aa004f/libexec/gcc/x86_64-pc-linux-gnu/15.0.0/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: ../gcc/configure --disable-multilib --disable-bootstrap --enable-languages=c,c++ --prefix=/home/software/gcc-trunk-3aa004f --enable-coverage Thread model: posix Supported LTO compression algorithms: zlib gcc version 15.0.0 20240630 (experimental) (GCC) ******************************************************************************* Program: $ cat mutant.c int b; void c() { struct d { int a[b] } e() { } struct d f() { return e(); } f(); } ******************************************************************************* Command Lines: $ gcc -flto mutant.c mutant.c: In function 'c': mutant.c:5:3: warning: no semicolon at end of struct or union 5 | } e() { | ^ mutant.c: In function 'f': mutant.c:7:12: error: invalid conversion in gimple call 7 | struct d f() { return e(); } | ^ struct d struct d # .MEM_14 = VDEF <.MEM_13(D)> <retval> = e (); [static-chain: CHAIN.3_8(D)] [return slot optimization] during GIMPLE pass: fixup_cfg mutant.c:7:12: internal compiler error: verify_gimple failed 0x4ddb72b diagnostic_context::report_diagnostic(diagnostic_info*) ???:0 0x4ddbffd diagnostic_context::diagnostic_impl(rich_location*, diagnostic_metadata const*, int, char const*, __va_list_tag (*) [1], diagnostic_t) ???:0 0x4dfc327 internal_error(char const*, ...) ???:0 0x1cc84a5 verify_gimple_in_cfg(function*, bool, bool) ???:0 Please submit a full bug report, with preprocessed source (by using -freport-bug). Please include the complete backtrace with any bug report. See <https://gcc.gnu.org/bugs/> for instructions. lto-wrapper: fatal error: /home/software/gcc-trunk-3aa004f/bin/gcc returned 1 exit status compilation terminated. /usr/bin/ld: error: lto-wrapper failed collect2: error: ld returned 1 exit status Also ICE on trunk. Compiler Explorer: https://godbolt.org/z/x8fPWKqs7